The credit card and confirmation advice are correct.
I ordered tickets to Thoroughly Modern Millie and they were mailed to the wrong address.
It helped that I knew the house manager, but regardless, if you bring your credit card and confirmation to the box office, they will assist you. This of course is a worst-case scenario.
I'm sure you'll have your tickets available before you need them :)
"It's the little things; the details, that distinguish the Barbra Streisands from the Rosalyn Kinds."~Gilmore Girls~